Video: Maria Sharapova nuts Novak Djokovic with 'ballsy' serve

Gentlemen, consider yourselves warned: this one is going to hurt. While filming a TV commercial, tennis superstar Maria Sharapova launched a nutcracker of a serve directly between the legs of Serbian tennis star Novak Djokovic.

The painful incident occurred during the shooting of an ad for sporting equipment and clothing manufacturer Head, and it was caught on video and posted on YouTube. ABC News reports that it is uncertain whether or not the accident was in fact really an accident; according to Yahoo! Sports, Sharapova and Djokovic, who is currently the world's second-ranked male tennis player and playing for his country in the Olympics, have engaged in mischievous hijinks before. But the scrotum-smashing serve certainly appears to be real... watch the video and judge for yourself!